diff --git a/stage4/04-pisdr-system/00-packages b/stage4/04-pisdr-system/00-packages
index 60ca1ae..5020efa 100644
--- a/stage4/04-pisdr-system/00-packages
+++ b/stage4/04-pisdr-system/00-packages
@@ -1,6 +1,7 @@
 vim
 tmux
 cmake
+ninja-build
 build-essential
 git
 pkg-config
diff --git a/stage4/04-pisdr-system/03-run.sh b/stage4/04-pisdr-system/03-run.sh
index 946d0ed..f2d479c 100755
--- a/stage4/04-pisdr-system/03-run.sh
+++ b/stage4/04-pisdr-system/03-run.sh
@@ -1,6 +1,8 @@
 #!/bin/bash -e
 
+install -m 755 patch/export.txt "${ROOTFS_DIR}/etc/"
+
 on_chroot << EOF
-python3 -m pip install cmake
-python3 -m pip install ninja
+cat /etc/export.txt >> /home/${FIRST_USER_NAME}/.bashrc
+source /home/${FIRST_USER_NAME}/.bashrc
 EOF
diff --git a/stage4/04-pisdr-system/04-run.sh b/stage4/04-pisdr-system/04-run.sh
deleted file mode 100755
index f2d479c..0000000
--- a/stage4/04-pisdr-system/04-run.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/bin/bash -e
-
-install -m 755 patch/export.txt "${ROOTFS_DIR}/etc/"
-
-on_chroot << EOF
-cat /etc/export.txt >> /home/${FIRST_USER_NAME}/.bashrc
-source /home/${FIRST_USER_NAME}/.bashrc
-EOF